Orders of magnitude, estimation and analogy in Chemistry... How do you convey to your students the scale of numbers indicated by the mole? One way is to use an analogy I've often introduced the mole using an analogy and have used many examples over the years. Here's a selection you may want to consider... Raindrops We'll change this to cubic kilometres using a conversion factor... The volume of 1 mole of raindrops will be 24 million cubic kilometres. The estimated volume of